Plagiarism?

I ve kept at least a B n class all semester. For our final we had to write a paper over gun violence. This would be my 3rd time having to write over this. So like i did the second time i used the paper from before. Still passed. The 3rd time my teacher gave me a complete F for the class because “copied” from another student from the north campus. BUT I M THAT STUDENT FROM THE NORTH CAMPUS. Is she allowed to do that? She s not changing it either.

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